Electronic device with fan

Abstract

An electronic device includes a mainboard and a fan mounted on the mainboard. The fan includes a stator and a rotor. The rotor includes a hub covering around a periphery of the stator, and a plurality of blades disposed at a periphery of the hub. The stator is directly fixed to and directly electrically connected to the mainboard.

What is claimed is: 
     
         1 . An electronic device comprising:
 a mainboard; and   a fan mounted on the mainboard, the fan comprising a stator and a rotor, the rotor comprising a hub covering around a periphery of the stator and a plurality of blades disposed at a periphery of the hub, the stator being directly fixed to and directly electrically connected to the mainboard.   
     
     
         2 . The electronic device of  claim 1 , wherein the mainboard defines a plurality of spaced arc-shaped inserting holes, a plurality of arc-shaped inserting portions being formed at a bottom of the stator, the inserting portions being inserted into the inserting holes of the mainboard to fix the stator on the mainboard. 
     
     
         3 . The electronic device of  claim 2 , wherein the inserting holes are located on a same circle. 
     
     
         4 . The electronic device of  claim 2 , wherein the mainboard defines two through holes located at a periphery of the inserting holes, two protrusions being formed at the bottom of the stator, the inserting portions being located at a center of the stator, the protrusions being located at a periphery of the inserting portions, the protrusions being inserted into the through holes of the mainboard to further fix the stator on the mainboard. 
     
     
         5 . The electronic device of  claim 4 , wherein the mainboard defines a plurality of air inlets located at a periphery of the through holes. 
     
     
         6 . The electronic device of  claim 1 , wherein the fan further comprises a fan frame fixed on the mainboard, the fan frame comprising a cover plate and a sidewall extending downward from an outer edge of the cover plate, the cover plate defining an air inlet, an air outlet being defined in the sidewall, the cover plate, the sidewall and the mainboard cooperatively defining a chamber receiving the stator and the rotor therein. 
     
     
         7 . The electronic device of  claim 6 , wherein a fixing portion protrudes outward from a periphery of the sidewall for mounting the fan frame on the mainboard. 
     
     
         8 . The electronic device of  claim 6 , wherein the mainboard defines another air inlet corresponding to the air inlet of the fan frame. 
     
     
         9 . The electronic device of  claim 1 , wherein the stator comprises a stator core and a plurality of stator coils, the stator coils being wound on the stator core, the mainboard being electrically connected with the stator coils to provide electrical current to the stator coils. 
     
     
         10 . The electronic device of  claim 9 , wherein the stator core defines a through hole in a center thereof, a sleeve being received in the through hole of the stator core. 
     
     
         11 . The electronic device of  claim 10 , wherein the rotor further comprises a shaft, an end of the shaft being fixed at a center of the hub, another end of the shaft being inserted into the sleeve. 
     
     
         12 . The electronic device of  claim 11 , wherein the hub comprises a top wall and a cylindrical sidewall extending downwardly from an outer periphery of the top wall, the blades extending radially and outwardly from an outer surface of the sidewall of the hub, the shaft being fixed at a central portion of the top wall of the hub. 
     
     
         13 . The electronic device of  claim 12 , wherein the rotor further comprises a magnet unit, the magnet unit comprising a hollow shell and a cylindrical permanent magnet received in the shell, the shell being attached to an inner surface of the sidewall of the hub. 
     
     
         14 . An electronic device comprising:
 a mainboard; and   a fan comprising a fan frame, a stator and a rotor, the stator being fixed on and electrically connected to the mainboard, the fan frame comprising a cover plate and a sidewall extending downward from the cover plate, the sidewall being engaged on the mainboard, the cover plate, the sidewall and the mainboard cooperatively defining a chamber receiving the stator and the rotor therein.   
     
     
         15 . The electronic device of  claim 14 , wherein the mainboard defines a plurality of spaced arc-shaped inserting holes, a plurality of arc-shaped inserting portions being formed at a bottom of the stator, the inserting portions being inserted into the inserting holes of the mainboard to fix the stator on the mainboard. 
     
     
         16 . The electronic device of  claim 15 , wherein the inserting holes are located in a same circle. 
     
     
         17 . The electronic device of  claim 15 , wherein the mainboard defines two through holes located at a periphery of the inserting holes, two protrusions being formed at the bottom of the stator, the inserting portions being located at a center of the stator, the protrusions being located at a periphery of the inserting portions, the protrusions being inserted into the through holes of the mainboard to further fix the stator on the mainboard. 
     
     
         18 . The electronic device of  claim 17 , wherein the mainboard defines a plurality of air inlets located at a periphery of the through holes.